Lantern or inclosure for lamps.



H. AYRTON.

LANTERN 0R INGLOSURE FOR LAMPS.

.APILIOATION FILED FEB.3, 1914.

1,125,438. Patented Ja11.19, 1915.

4 SHEETS-SHEET 1.

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' THE NORRIS PETERS COJPHOTQLITHQ. WASHINGTON. D. C.

H. AYRTON.

LANTERN 0R INGLOSURE FOR LAMPS.

APPLICATION FILED FEB. 3, 1914.

Patented Jan. 19, 1915.

4 SHEETS-SHEET 2.

J if? Iv NORRIS PEIERS CON PHoTo-LlTHO.. WASwHINGTON. J4 c H. AYRTON.

LANTERN OR INGLOSURE FOB. LAMPS.

APPLICATION FILED rmm, 1914.

1,125,438, Patented Jan. 19, 1915.

4 SHEETS8HEET 3.

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LANTERN 0R INGLOSURE FOR LAMPS.

APPLIOATION FILED FEB.3, 1914.

Patented Jan. 19, 1915.

4 SHEETS-SHEET 4.

THE NORRIS PETERS C0,, PHUTO-LITHQ, WASHINGTON, D C.

HERTI-IA AYRTON, OF LONDON, ENGLAND.

LANTERN 0R INCLOSURE FOR LAMPS.

Specification of Letters Patent.

Patented Jan. 19, 1915.

Application filed February 3, 1914. Serial No. 816,139.

To all whom it may concern:

Be it known that I, HERTHA AYRTON, residing at 41 Norfolk Square, Hyde Park, in the county of London, England, scientist, have invented new and useful Improvements in or relating to Lanterns or Inclosures for Lamps Used for Proiecting a Beam of Light, of which the following is a specification.

This invention relates to lanterns or inclosures for lamps used for projecting a beam of light.

The invention has for its object to provide means for keeping the lamp or lantern or inclosure cool and well ventilated.

In common with other apparatus of this kind, a lantern or inclosure made in accordance with the present invention comprises an inner shield. body part, or lantern forming a chamber within which is arranged the lamp, and an. outer shield having a vertical ventilating space between it and the inner shield.

According to the present invention an in closure or lantern for lamps used for projecting a beam of light comprises an inner shield, body part, or lantern inclosing the lamp and an outer shield surrounding the inner shield and spaced apart therefrom so as to form a vertical ventilating space between the two shields which ventilating space is open to the atmosphere at its upper and lower ends. If required the inner shield may be of wire gauze, perforated metal, or equivalent material, and the outer shield may be of asbestos or other suitable heat insulating material suitably strengthened in some cases by wire gauze or equivalent reinforcing material. In some cases the outer shield may be of metal which may or may not be lined or covered with asbestos or the like. "Where the invention is applied to gas or other lamp with a naked flame having no chimney the foraminous nature of the inner shield may serve to supply air to the flame. The ventilating space or spaces are preferably arranged. so that the ventilation is symmetrical or substantially so.

According to this invention as applied to are lamps the inner inclosure of what is hereinafter called the lamphouse is made entirely, or for the most part, of wire gauze or perforated metal, or any other suitable material, and the outer cover of asbestos, the cover being either of asbestos cloth hanga plan, the lower half being a section on line E F of Fig. 2. Figs. 4 and 5 are perspective views showing details of the struc ture.

Figs. 6 and 7 are further details. The lamphouse shown in the drawings consists of an innerchamber-a of wire gauze,

the four vertical sides of the chamber are inclosed by an outer frame or wall I) suitably spaced apart from the inner chamber so as to leave a ventilating space 0, open at 'top and bottom. The air space is shown tapered from the bottom to the top but this is not essential.

In the frontof the lamphouse the cylindrical extension at stretches across the air space and is adapted in any suitable wav to carry the lens which is not shown. The top of the'inner chamberais covered in by a plate a and a chimney a is fitted toward the rear end. I

The framework of the structure may be made in any suitable way for example the skeleton framework may be made as shown in the perspective views Figs. 4 and 5, the inner gauze walls and the outer asbestos walls being clamped in position by suitable frames o and b respectively screwed in position as indicated in Figs. 1 to 3.

Fig. 6 shows an enlargement of the construction of the tube for receiving the lens.

f, Fig. 2, are the slots in the side walls of chambers which permit the operating handle to pass out and leave room for the operation thereof. Fig. 7 shows how the said slots are fitted with a cone or sleeve 9 of asbestos cloth which is fitted at its larger end 9 into the wire gauze of the inner chamber, the small end 9'' being wired around the handle h or otherwise secured thereto. Such cones are also fitted on to the corresponding slots in the outer shield.

In the construction shown a door is provided in the front half of the lamphouse at 2' Figs. 2 and 3. The outer part of the door which is of asbestos and coincides with the outer inclosure is hinged as at i (see Fig. 5) and the inner part of the door 71 which is of gauze and coincides with the inner gauze chamber is connected to and carried upon the outer part 2" by means ofspacing bars j Fig. 8.

It will readily be seen from the drawings that free ventilation is provided around the whole of the inner chamber by the air space a the cooling being facilitated by the Wire inner gauze inclosure, the whole structure providing an ample and very symmetrical and well distributed ventilation. The outer insulating wall of asbestos protects the operator from excessive heat. If required the ventilation air space need not extend around the whole-of the lamphouse for ex; ample the front ventilating air space may be dispensed with. V p

' Having described one construction of my invention particularly in regard to are lamps it would be readily understood how it may be applied in an equivalent manner to lamps of otherkinds used for projecting a beam of light, as hereinbefore mentioned.

What I claim and desire to secure by Letters Patent is 1 1. An inclosure for lamps used for projecting a beam of light comprising an inner shield disposed around the lamp, and an outer shield disposed around the inner shield and spaced apart therefrom, the space between the inner and outer shields being open to the atmosphere at its upper and lower ends, the inner shield being made,

for the most part, of foraminous material,

as set forth. 7 2. An inclosure. for lamps used for projecting a beam of light, comprising an inner shield disposed around the lamp, and an outer shield disposed around the inner shield and spaced apart therefrom, the

space between the inner and outer shields being open to the atmosphere at its upper and lower ends, the inner shield being made, for the most part, of foraminous material and the outer shield being, made, for the most part, of heat insulating material such as asbestos, as set forth.

3. An inclosure for lamps used for projectin'g a beam of light comprising an inner shield disposed aroundthe lamp, and an outer shield disposed around the inner shield. leaving a symmetrical space around the lamp between the inner and outer shields, which space is open to the atmosphere at the upper'and lower ends the inner shield being made, for the most part, of foraminous material, as set forth.

1-. An inclosure for lamps used for pro: jecting a beam of light comprising an inner shield disposed around the lamp, and an outer shield disposed around the inner shield leaving a symmetrical space around the lamp between the inner and outer shields, which space is open to the atmos phere at the upper. and lower ends the inner shield being made, for-the most part, of foraminous material and the'outer shield being made for the most part,'of heat insulating material such as asbestos, as set forth.

In witness whereof, I have hereunto signedmy name in the presence of two subscribing witnesses.

HERTHA AYRTON.

Witnesses: G. V. SYMES,

ALFRED B. CAMPBEIL.

' Copies of this patent may beobtained for five cents each, by addressing the Commissioner of Patents,

Washington, 1). C. V 

